Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fcda686f04e701…

MALICIOUS

PDF

7.8 KB Created: 2021-10-10 08:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1b743edf1b7490d07c5f8d641725c4b7 SHA-1: c0895e3c22eb5f8b0a09bfb8f064a3ec8410ad89 SHA-256: 87fcda686f04e701c19794795df3b3db179b9da871bcd5972022e378298e83c2
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file utilizes an image-only lure, a common tactic to disguise malicious links. Heuristics indicate it's an image-based phishing lure with a deceptive host link. The embedded URL points to a suspicious domain, likely intended to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5618

Heuristics 4

  • Image-only PDF lure links to a deceptive (typosquat) host high PDF_IMAGE_LURE_DECEPTIVE_HOST_LINK
    PDF is image-heavy with little real text and its clickable action targets a host that impersonates a security/service/brand word with a look-alike homoglyph substitution — a digit OR a confusable letter (e.g. 'serv1ce', 'servlce', 'upd4te', 'm1cr0s0ft') — on a domain that is not a known-good site. This is a credential-phishing / fake-update carrier shape: a screenshot-like page funnels the victim to a deceptive look-alike destination.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 2 image(s), only 0 text block(s), carries a click-outward action, and is only 7 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://yughjenewerbeegenmwr.updta78-serv1ce.info PDF link annotation
    • http://www.microsoft.com/typography/ctfontshttp://www.fonts.comMicrosoftIn PDF document text
    • http://www.microsoft.com/typography/fonts/default.aspxIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17 6180 bytes
SHA-256: 56a52b815ab1d3320d2b86f77abd9fd9ddb7ef0bf6f0425b132bd10f1381ab15

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